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".content .subject" - a descendant selector. It specifies that the style is applied to any element of class "subject" that is a descendant (child, grandchild, etc.) of any element of class "content".

".content a.articlehead[href] > .subject:hover" - wow, this is a fun one! The border-bottom style defined here is to be applied only when the cursor is hovering over any element of class "subject" that is a child directly underneath an "a" element of class "articlehead" that also must include an "href" attribute, and which itself is a descendant of an element of class "content". Whew! I don't know who wrote that, but they have a mean streak. At least they included a potentially helpful comment.

".author, .date" - the comma indicates there are two entirely distinct selectors being defined here, so any element with a class of either "author" or "date" would use the specified style info.

If you're going to be dealing with a lot of this stuff, you probably should get a book on CSS - the O'Reilly book "CSS: The Definitive Guide" is quite good I suspect, as I have its predecessor by the same author. Or at least you may want to check out some of the CSS resources listed at Learning CSS.